Do you actually fill it or just line the inside of it? I can't get a spoon to fit in there! Seems like if you fill it up, they are eating a ton of treat for a few minutes before they get to the hard part. I don't want him to eat too much and get sick or something. I'm not sure how much PB he can have. I just get terrified of him getting diaharrea or something. He had giardia when we first brought him home and our house was disgusting for at least a week!!
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